EVOLUTION* OF MODERN SURFACE FEATURES 



49 





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400 Miles 



Fig. 10. Map of California, showing the two types of basement in the 

 Coast Ranges and adjacent areas. 1, Nevadan basement of metamorphic 

 and plutonic rocks. 2, Franciscan basement of strongly deformed but 

 little metamorphosed clastic sedimentary rocks; probable extent of 

 Franciscan basement beneath cover of younger sediments indicated by 

 light stipple. 3, Areas covered by younger sedimentary and volcanic 

 rocks. 4, Faults, many of which have large components of lateral dis- 

 placement. 5, Edge of continental area. 



